Guides for Shopify merchants on what shipping really costs: label adjustments, carrier disputes, rates that undercharge, and duties you paid but didn't collect.
Free-shipping thresholds that cover Alaska, products with no weight, bundles that ship in three boxes. How to measure the gap between what checkout charged and what shipping cost, with a calculator and fixes for each cause.
Read the guideCarriers re-check every package and bill the difference days or weeks later. Where adjustments show up in Shopify, the reasons carriers give, how to dispute a wrong one, and how to stop paying for the right ones.
Read the guideDimensional weight, address corrections and surcharges billed after delivery. The 2026 amounts, a dimensional weight calculator, the 180-day dispute window, and what to send so a dispute holds up.
Read the guideRefused DAP parcels, missing HS codes and carrier disbursement fees checkout never includes. DDP vs DAP, the 2026 de minimis changes by country, and how to collect duties at Shopify checkout.
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